The General Transit Feed Specification (GTFS) defines a common format for public transportation schedules, enabling transit agencies and developers to deliver and consume data in a standard structure. The GTFS Data Exchange was built to enable efficient sharing and retrieval of GTFS data. The GTFS Data Exchange API provides developer access to participating agencies and their GTFS feed sources.
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The onebusaway-gtfs-realtime-api is composed of Java classes generated using the GTFS-realtime protocol buffer specification, which defines a standard for exchanging real-time public transit information in a machine-readable format. The library also contains extensions for OneBusAway and NYCT.